Datasheet

MAX71020
Single-Chip Electricity Meter AFE
4Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ADC CONVERTER PERFORMANCE SPECIFICATIONS
Recommended Input Range
(with Respect to GNDA)
VA, VB, IBP, IBN -250 +250 mVpk
Recommended Input Range
(with Respect to GNDA)
IAP, IAN: preamplifier enabled -27.78 +27.78
mVpk
IAP, IAN: preamplifier disabled -250 +250
Input Impedance, No
Preamplifier
f
IN
= 65Hz 50 100 kω
ADC Gain Error vs Percentage
Power-Supply Variation
∆
∆
6
PK IN
10 Nout 357nV V
100 V3P3A 3.3
V
IN
= 200mV peak, 65Hz; V
V3P3A
= 3.0V, 3.6V 81 ppm/%
Input Offset IAP = IAN = GNDA -10 +10 mV
Total Harmonic Distortion at
250mVpk
V
IN
= 55Hz, 250mVpk, 64kpts FFT,
Blackman Harris Window
-85 dB
Total Harmonic Distortion at
20mVpk
V
IN
= 55Hz, 20mVpk, 64kpts FFT,
Blackman Harris Window
-90 dB
LSB Size (LSB Values Do Not
Include the 9-Bit Left Shift at
the CE Input)
V
IN
= 55Hz, 20mVpk,
64kpts FFT, Blackman-
Harris window, 10MHz
ADC clock
FIRLEN = 15 120.46
nV
FIRLEN = 14 146.20
FIRLEN = 13 179.82
FIRLEN = 12 224.59
FIRLEN = 11 285.54
FIRLEN = 10 370.71
Digital Full Scale
V
IN
= 55Hz, 400mVpk,
10MHz ADC clock
FIRLEN = 15
Q2621440
LSB
FIRLEN = 14
Q2160000
FIRLEN = 13
Q1756160
FIRLEN = 12
Q1406080
FIRLEN = 11
Q1105920
FIRLEN = 10
Q851840
PREAMPLIFIER PERFORMANCE SPECIFICATIONS
Differential Gain,
(V
IN
= 28mV Differential)
T
A
= +25°C, V
V3P3A
= 3.3V, preamplifier enabled 8.9 V/V
Differential Gain
(V
IN
= 15mV Differential)
Gain Variation vs. V
3P3A
(V
IN
= 28mV Differential)
V
V3P3A
= 3.0V, 3.6V -72 ppm/%
Gain Variation vs. Temperature
(V
IN
= 28mV Differential)
T
A
= -40°C to +85°C -45 ppm/°C
Phase Shift (V
IN
= 28mV
Differential)
T
A
= +25°C, V
V3P3A
= 3.3V (Note 4) 0 8
milli-
degree
Preamplifier Input Current (I
IAP
)
Preamplifier enabled, IADC0 = IADC1 = GNDA 9
15 20 µA
Preamplifier Input Current (I
IAN
)